It sounds very similar to a common problem on OS3.9. If you install ClassAct (which is what older versions of ReAction were called) almost everything that uses ReAction classes will break, and due to some weirdness with error reporting the actual affected file(s) is not mentioned. AWeb is a common cause of this problem (older versions come with ClassAct); maybe AmigaKit's software package is similar.
To determine whether that's what happened, check the contents of SYS:Classes and its subdirectories. If any files are dated earlier than the build date of 3.2 (April 2021), restore them from the original disks.
(If you don't have
DOpus or a similar file manager installed, install it - it makes tracking down file problems soooooo much easier than via Workbench/Shell.)
